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Park, Jaeyeong
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  • Radioactive waste treatment and management; Spent nuclear fuel recycling; Decontamination and Decommissioning; Nuclear Fuel Cycle

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Spatial distribution of HfBi in metallurgically and electrochemically formed Bi-Hf alloy

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Title
Spatial distribution of HfBi in metallurgically and electrochemically formed Bi-Hf alloy
Author
Sohn, SungjuneJeong, Gwan YoonHur, JunghoJeong, SeongjinPark, JaeyeongHwang, Il Soon
Issue Date
2019-06
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.790, pp.772 - 782
Abstract
This study presents the spatial distribution of HfBi intermetallic compound in Bi-Hf alloy formed by potentiostatic electrodeposition to investigate the feasibility of density-based separation between Zr and Hf in liquid Bi phase. Prior to electrochemical alloy formation, four Bi-Hf alloys were produced metallurgically with the consideration of the Hf concentration in the alloy and the mixing effect on the liquid Bi. Then electrochemical behaviors of HfCl4 in LiCl-KCl was investigated by cyclic voltammetry (CV) using tungsten and Bi coated electrode at 500 °C. The apparent reduction potential and diffusion coefficient were calculated by determination of reversibility for single redox Hf4+/Hf reaction. Two Bi-Hf alloys were produced by potentiostatic electrodeposition in LiCl-KCl-HfCl4/Bi system at 500 °C. Applied cathodic potential of −1.1 V vs. Ag/AgCl 1 wt % was determined from the CV results. The spatial distribution of intermetallic compound was obtained on the vertical cross section of Bi-Hf alloys. HfBi phase was characterized by SEM-EDS and XRD analysis. It is identified that HfBi was clearly formed and precipitated in the bottom of the Bi-Hf alloy during the electrodeposition, supporting the possibility of the separation of Hf from Zr by their density differences.
URI
https://scholarworks.unist.ac.kr/handle/201301/26617
URL
https://www.sciencedirect.com/science/article/pii/S0925838819309879
DOI
10.1016/j.jallcom.2019.03.174
ISSN
0925-8388
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